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condensed steam is distilled water, no chemicals or sediment from that... the fill water will have innumerable additives, and just plain muck. it's NOT good for the boiler, it's VERY BAD to constantly have water entering the boiler.

The TRUE highest cost system is the system not installed properly...
The three big summer hearththrobs...
Mel Gibson
Dwane Johnson
The A/C repairman

No, I had not thought about vented risers in the attics. If the cottages are both two story, and the seven garages single story, what would be the reason for vent risers in the attic...... Thanks for you concerns and thinking out loud..... Frank S

If after everything you still can find no leak, I would check the boiler sections to make sure your leak is not there. A leak between the sections would not be seen due to evaporation. Although I think a 20 gallon leak between sections would have been noticed.

condensed steam is distilled water, no chemicals or sediment from that... the fill water will have innumerable additives, and just plain muck. it's NOT good for the boiler, it's VERY BAD to constantly have water entering the boiler.

Unless there is regular boiler blowdown, this is correct. I'm a commercial boiler guy; I don't think resi boilers do blowdown, right?

Electricity makes refrigeration happen.

Refrigeration makes the HVAC psychrometric process happen.

HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.

No, I had not thought about vented risers in the attics. If the cottages are both two story, and the seven garages single story, what would be the reason for vent risers in the attic...... Thanks for you concerns and thinking out loud..... Frank S

can't recall off-hand the purpose of the vents in attics, but you system was originally installed during that era, the boys over to heatinghelp could probably answer the vent question easily

It`s better to be silent and thought the fool; than speak and remove all doubt.

Leaks in steam and condensate return lines are sometimes very hard to find if the pipes are covered with insulation and some insulation is worse than others. Steam can leak and evaporate without visible signs through the insulation. The same can happen with condensate return water depending on where the leak is. Some insulation is a very good wicking material and the moisture will evaporate from it without showing you even a wet spot on the outside.

Temperature differences in a length of piping (with insulation on it) is almost always a dead giveaway. A simple infrared thermometer can help pinpoint these leaks. Wherever the leak is that spot in the insulation will be warmer. Of course a thermal imaging device of some sort is even easier and quicker.

Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

That was done on hot water systems. Instead of using an expansion tank, and vent would go up to the attic. usually they ran it out side in case of over flow. But not always.

That reminds me of the time I replaced an old gravity boiler. I couldn't get the system to hold pressure, I went out to the van for some reason and noticed water shooting out the side of the house. Found the tank in the second floor bathroom and capped it off.